Abstract: The present invention relates to a frequency-hopped single sideband (SSB) mobile radio system implemented by hopping the carrier frequency of an input signal (s(t)) every .tau. seconds. The hopping is controlled by a carrier-frequency-hopped sequence (f.sub.i (t)) generated by a carrier-frequency-hopping generator (16,24). When employed in a frequency-hopped SSB transmitter (10), the carrier sequence functions to modulate the input signal, "hopping" it to a different carrier frequency every .tau. seconds. The carrier-frequency-hopped SSB receiver (20) employs the identical carrier sequence as used by the transmitter to demodulate the transmitted carrier-frequency-hopped SSB signal, thereby recovering the original single sideband signal (s(t)). By frequency hopping the carrier signal of an SSB signal, the present invention mitigates the effects of co-channel interference and frequency selective fading inherent in prior art SSB cellular mobile radio systems.

Abstract: The present invention relates to a majority logic spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, 2.sup.K -ary frequency shift keyed signals to determine the correct signal of a particular user. In operation, the receiver spectrum-analyzes the received signal to determine which frequency components are present during each of the L chip intervals and then modulates a particular user's L-length FH address signal with the derived frequency components to arrive at a 2.sup.K by L-length detection matrix. A majority logic decision circuit determines the level having the maximum number of derived frequency components along the L-length axis of the matrix, or which is the most likely level of multiple equal levels, and decodes the chosen 2.sup.K level into the indicated message signal.